This kind of asynchronous I/O is defined in the Posix RT specification
and should all be in glibc 2.1.x at some point (the 2.1.x kernel has
real time signals - which queue and contain one byte of data - the
C library can do the rest with clone() and signal handlers).
> Yep, this was very cool. I used it for great effect in a MUD game I wrote
> on VAX/VMS 5.1 yonks ago at university.
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